<template>
  <view>
    <!-- 使用自定义搜素组件 -->
    <!-- <my-search bgcolor="pink" radius="5"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="lefg-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
         <!-- 二级菜单的标题 -->
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
         <!-- 三级菜单 -->
         <view class="cate-lv3-list">
           <!-- 三级菜单的item项 -->
           <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
             <image :src="item3.cat_icon"></image>
             <text>{{item3.cat_name}}</text>
           </view>
         </view>
         </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
import badgeMix from '@/mixins/tabber-badge.js'
  
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        // 分类数据列表
        cateList: [],
        active: 0,
        // 二级分类数据列表
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    
    methods:{
      // 获取分类列表数据
      async getCateList() {
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = this.cateList[0].children
      },
      activeChange(i){
        this.active = i 
        
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      
      gotoSearch(){
        uni.navigateTo({
          url:'../../subpkg/search/search'
        })
      }
      
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  
  .lefg-scroll-view {
    width: 120px;
    
    .left-scroll-view-item {
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #FFFFFF;
        position: relative;
        
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}

.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    display: flex;
    width: 33.33%;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
      text-align: center;
    }
  }
}
</style>
